Washington Nationals third base coach Trent Jewett holds a Navy hat during moment of silence before a game against the Atlanta Braves at Nationals Park Tuesday in Washington. The Nationals wore Navy hats, presented to them by Adm. James A. Winnefield, vice-chairman of the Joint Chiefs of Staff, before the game, to honor those killed and injured in the attack Monday at the nearby Washington Navy Yard. (Alex Brandon/AP)

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Moment of silence

Holding Navy hats, Washington Nationals manager Davey Johnson, right, and the rest of the Nationals team observe a moment of silence before a game against the Atlanta Braves at Nationals Park Tuesday. (Alex Brandon/AP)

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Harper mourns

Washington Nationals left fielder Bryce Harper arrives in the dugout wearing a Navy hat before game against the Atlanta Braves at Nationals Park Tuesday. (Alex Brandon/AP)

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Braves bow their heads

The Atlanta Braves observe a moment of silence before a game against the Washington Nationals at Nationals Park Tuesday to honor those killed and injured in Monday's attack at the nearby Washington Navy Yard. (Alex Brandon/AP)

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Navy hat

Washington Nationals manager Davey Johnson holds a Navy hat over his heart during a moment of silence Tuesday. (Alex Brandon/AP)

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Ian Krol

Washington Nationals relief pitcher Ian Krol wears a Navy hat in the dugout before the game Tuesday. (Alex Brandon/AP)

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Don Mattingly

Los Angeles Dodgers manager Don Mattingly pauses during a moment of silence prior to a game against the Arizona Diamondbacks on Monday in Phoenix. (Ross D. Franklin/AP)

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Fans mourn

Fans pause in a moment of silence at Chase Field. Monday in Phoenix. (Ross D. Franklin/AP)

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Athletics moment of silence

Oakland Athletics and fans hold a moment of silence prior to the game against the Los Angeles Angels Monday in Oakland. (Ben Margot/AP)